Understanding the Photoelectric Effect

This is a homework activity designed to help students understand how the photoelectric effect experiment works and why a photon model of light is necessary to explain the results. It was developed to be used in a sophomore level modern physics class, after lecture instruction on the photoelectric effect. For more details about the course, please see: http://per.colorado.edu/modern. This activity was used in a course where questions were constrained to being multiple choice or numeric for computer grading, so it is not as inquiry based.